螺栓强度等级区分

螺栓强度等级及其性能特性

Bolt Grade Markings and Strength

Metric

Nominal

Head Grade or Size

Material

Markings Class Range

Mechanical Properties

Minimum Minimum

Proof Yield Tensile

(Inches)

Load (psi)Strength Strength

(psi) (psi)

Class 8.8

Medium Carbon

All Sizes thru 1-Steel, Quenched

1/2

and Tempered

85,000 92,000 120,000

8.8

Class 10.9

Alloy Steel,

Quenched and Tempered

All Sizes thru 1-1/2

120,000 130,000 150,000

10.9

1/4 thru 5/8

Stainless markings vary. Most stainless is non-magnetic

Steel alloy with

17-19%

A-2 Stainless

Chromium and 8-13% Nickel

80,000 – 90,000

100,000 – 125,000 100,000

3/4 thru 1

45,000 – 70,000

Above 1 80,000 – 90,000

Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. Yield Strength: The maximum load at which a material exhibits a specific permanent deformation

Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set.

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